Apparatus for surface hardening of the inner wall of hollow bodies



I F; KLOPP 1,892,843 Arr/anus r'on suamcz HARDBNING OF rum mum WALL or adnmw onms Jan. 3, 1933.

Original Filed Febxvfissl v:s Sneaks-sheet )L Y: A N m Jan. 3, 1933. F. L P 1,892,843

APPARATUS FOR SURFACE HARDEN ING OF THE INNER WALL 0F HOLLOW BODIES Original Filed Feb. 7. 1931' 3 sheet-s'neet 2' Jan. 3, 1933. KLQPP 1,892,843

APPARATUS son summon HARDENING OF THE mum WALL 0F uoLLow BODIES Original File E1 b. 7'. 1951 a Sheets-Sheet 3 Patented Jan. 3, 1933 UNITED... STATES FRIEDRICH KLOPIP, 0F SOLINGEN-WALD, GERMANY APPARATUS FOR SURFACE HARDENING OF THE INNER WALL OF HOLLOW BODIES Application filed February 7, 1931, Serial No. 514,295, and in Germany February 24, 1930. Renewed October 18, 1932. I

This invention relates to an apparatus for the surface hardening of the inner wall of hollow bodies, for instance cylinder bores, and wherein the bodies to be hardened are conducted successively by an endless double link chain onto a table adapted to be lowered into a tank filled with hardening liquid. While the bodies are on this table, suitable burners are inserted from above into the body to uniformly heat from below upwards the inner wall of the body when the table is being lowered into the hardening liquid, said heated inner walls being then instantaneously cooled by the hardening liquid and hardened.

An apparatus according to the invention is illustrated by way of example in the accompanying drawings in which;

Fig. 1 is an elevation of the apparatus,

Fig. 2 is a top plan View and Fig. 3 is a section on line 2-2 of Fig. 1.

A tank or vessel 1 is filled with hardening liquid'and an endless double link chain 2 is moved around said tank by means of sprocket wheels 3. Between the hlngs bolts 4 of the double link chain 2, plates 5 are arranged which have each at e centre a cut out portion 6. The longitudinal edges of said plates 5 are bevelled so that, when the double link chain 2 is circulating, said plates do not dro out on the lower side of said chain. In t e up er lap dropping out of the plates is impossi le as these plates rest on a bar 7. The portion of this bar 7 above the tank'l is cut out. Into this cut out portion a table plate 8 with an aperture 9 is arranged. This table plate 8 has lateral downwardly extending arms 10 engaging over the side walls of the tank 1 and having each a roller 11 resting on a ste 12 of a two step-cam disc 13. The cam iscs 13 are keyed on an axle 14 rotated by means of worm wheels 15. Above the table plate 8 burners 17 are fixed on a bridge 16. This bridge 16 has arms 18 extending downward along the side walls of the tank 1 and havin each a roller 19 resting upon the step 200 the corresponding cam disc 13. On the axle 14 two cam discs 21 are further mounted, against which rollers 22 of slides23 bear, the latter being guided each in a guide 24 and engaging, each by means of a detent 27,in ratchet wheels 26. The ratchet Wheels are keyed on an.axle 28 of the rear sprocket wheels 3.

w'hen the axle 14 rotates, the double link chaln 2 1s advanced step 'by step by the action of the cam discs 21 upon the ratchet discs 26 so that of the bodies 29 placed on the plates 5, which bodies in the example shown consist of four-cylinder blocks, one body at a time is standing over the aperture 9 of the table like plate 8. As soon as the double link cham 2 stops, the bridge 16 decends and the burners 17 engage in the bores of the body. Immediately hereafter the table like plate 8 sinks into the hardening liquid of the tank 1, and the inner walls of the bores of the body are uniformly heated from below upwards by the burners 17 and, instantaneously after theheating, they are cooled by the hardening liquid. The bridge 16 with the burners 17 and the table-like plate 8 with into the initial positions. At the next followmg stepwise forward movement of the double link chain 2 the hardened body 29- is removed from the table like plate 8 and the next fol lowing body deposited onthe same, whereupon the operation begins again.

I claim 1. An apparatus for surface hardening of the inner wall of hollow bodies, comprising in combination with a tank filled with hardening liquid, an endless double link chain, carrying the bodies to be hardened, guided across said tank, a table like plate having a central aperture and adapted to receive one of said hollow bodies from said endless chain, means for lowering said plate into and lifting the same out of the hardening liquid,'and a bridge carrying, burners adapted to be lowered and raised relatively to said tank so that said burners at the lowering of the plate heat the inner walls of said hollow bodies from below upward, the heated portions being instantaneously cooled by the hardening liquid.

2.- An apparatus as specified in claim 1, comprising, in combination with the tank, the table-like plate and the bridge carrying the the bodies 29 on the same are then returned burners, means for controlling said table and bridge consisting of two-step cam discs, lateral arms of said table downwardly extending on the outer side of said tank, rollers in the lower end of said arms resting each upon one of said steps of said came discs, lateral downwardly extending arms of said bridge, and rollers in the lower end of each of said bridge arms resting each upon a second step of said cam discs.

3. An apparatus as specified 'in claim 1, comprising in combination with the tank, the double link chain and the table-like plate, transverse lates in said, double linkchain having each adapted to carry a hollow body to be hardened and convey the same to above said tablelike plate.

In testimony whereof I aflix my signature.

FRIEDRICH KLOPP.

a central cut out portion and 

